<?php
// requirement : If sometime calculation goes wrong , but we don't require to show
// negative sign

$num = -23.68;
echo __LINE__."->".abs($num);
echo "\n";
echo __LINE__."->".round($num);
echo "\n";
echo __LINE__."->".round($num,1);
echo "\n";
echo __LINE__."->".ceil($num);
echo "\n";
echo __LINE__."->".floor($num);

